The discovery of neutrino oscillations is the first direct experimental evidence for new physics beyond
the standard model (SM) [1]}. One of the
simplest ways to probe the origin of the small neutrino
masses is by invoking the type I seesaw mechanism in which heavy
right-handed neutrinos (RHNs) are added to the SM [2]}. An attractive aspect of this mechanism is that it adresses three major puzzles in particle physics: the nature of
neutrinos, the smalness of neutrino masses, and the matter-antimatter
asymmetry problem. These three aspects provide also a
motivation for leptogenesis as an approach to explain the
BAU [3]}. In a nutshell, this approach requires lepton number violation which emerges naturally in type I seesaw models. Then, a
lepton asymmetry is created by the out of-thermal-equilibrium and \(CP\) 
violating decays of the RHNs that is converted into a baryon
asymmetry by electroweak sphalerons [4]}.
